JPS6044032A - Apparatus for compounding main substance and at least one additive substance, especially, highly viscous substance - Google Patents

Abstract

A dosing device for dosing viscous materials has a dosing cylinder for a main material and at least one dosing cylinder for an additive and a common drive for the dosing pistons of said dosing cylinders. In order to permit the simple dosing of the main material and the at least one additive in a time-constant volume ratio, and in order to permit changes to the volume ratio to be made in a simple manner, while permitting the dosing of highly viscous main materials and additives, the dosing cylinders are arranged parallel to one another and their dosing pistons are arranged to be driven with an identical stroke. The dosing piston of the at least one additive dosing cylinder is constructed as a plunger with a smaller cross-section than the cross-section of the associated dosing cylinder. In addition, the plunger is sealingly guided in an interchangeable guide bush of the dosing cylinder. Moveover, the at least one additive dosing cylinder is interchangeably connected as a subassembly to a support frame.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to a compounding device according to the preamble of claim 1.

Usually, a highly viscous substance such as silicone rubber is mixed in a large mixing device as a raw material for a packing material containing an appropriate amount of additives such as a pigment, and then filled into a case by a filling device. The power required for this mixing is considerable. Type of additive substance added and /'-! A change in the amount or quantity will increase the power required for cleaning, especially if dyes are added.

The device for compounding highly viscous substances known from DE 30 23 003 (US Patent Application No. A 244 822) is already known to be suitable for precisely compounding substances of the type described above. It is impossible to guide multiple substances together in fixed quantitative ratios.

The object of the present invention is to create a blending device that allows the main substance and at least one additional substance to be blended in constant volume ratios over time, and in which the volume ratios can be easily changed.

The above-mentioned problem is solved in a compounding device of this type by the features of claim 1.

Due to the arrangement of the blending cylinders and the completely equal strokes, mixing takes place in each case with equal volumes over one stroke, more precisely depending on the stroke speed and the constancy of the stroke movement. This makes it possible to mix the main substance and one or more additive substances in a continuous mixing device that operates almost continuously and feed them directly to the case filling device, in which case only one The total amount of the main substance and one or more additive substances of the process or of the process is filled into one case. Furthermore, the volume ratio can be easily changed, by simply replacing the plunger and the guide bush that receives it.

By the means set forth in claim 2, it is possible to easily change the type of additive substance, for example, to change the coloring matter. Of course, the means set forth in claim 2 can also be applied to change the volume ratio. In this case, the entire component is then replaced, followed by the plunger and the guide bush.

A completely parallel drive of each dosing piston is simply possible by the measures described in claim 3. In the case of a highly viscous substance, if the main substance and one or more additive substances are conveyed under pressure to the other side of a blending cylinder for a purpose or as needed, the scope of claim 4 is applicable. The described measures make it possible to more easily exchange the plunger of at least one dosing cylinder for the additive substance.

Claim 5 provides that the means according to claim 6 is characterized by a simple construction of the reservoir for quickly changing at least one compounding cylinder for additive substances. At least one of the following is required to be removable and replaceable, and to consume as little power as possible during cleaning.
Provides a concise configuration of one compounding cylinder. When the packing is arranged in this way, the area that requires cleaning becomes narrower than K.

According to claim 7, it becomes possible to easily operate the rotary frame even though only one side is subjected to a pressure load.

Claim 8r1. Providing means for facilitating rapid exchange of at least one compounding cylinder for one additive substance.

The compounding device according to the invention can be advantageously applied for compounding and guiding together transparent silicone rubber as the main substance and at least one pigment as the additive substance. In this case, one device can always convey the same type of main substance, ie transparent silicone rubber. In the case of dyes that require very simple technical modifications, only replacement is necessary. It is of course also possible to apply the compounding device according to the invention to other base substances or additive substances, for example in food product technology, if there are comparable problems.

The invention will now be described with reference to one embodiment and with reference to the accompanying drawings.

The compounding device illustrated in the drawing has a compounding cylinder 1 for the main substance, such as a transparent silicone rubber, and a further compounding cylinder 2 for the additive substance, such as a pigment. Of course, the number of blending cylinders, especially for additive substances, can be increased at will. Mixing cylinder i, 2
H, attached to the board 3 of the frame 4. The frame 4 has an upper support plate 5 that is parallel to the substrate 3 and corresponds to the type of cross beam, and four supports 6 that are arranged at each corner of the rectangular plates 3 and 5 and extend parallel to each other. 4 as a whole is formed into a square. Mixing cylinder 1
．． 2 extends parallel to the support 6.

Attached to the upper support plate 5 is a hydraulic working cylinder 7 as a linear drive for the blending cylinders 1, 2. The piston rod 8 of this hydraulic working cylinder 7 has a crosspiece 9
, and the blending cylinder 1.2 is driven from the crossbar 9 side. The distance between the center line jO of the hydraulic working cylinder 7 and the center line 11 of the blending cylinder 1, and the center line 1o
The distance between the center line 12 of the blending cylinder 2 and the centerline 12 of the blending cylinder 2 approximately corresponds to the transmission ratio of the blending cylinders 1 and 2, respectively, which will be described later.

As a result, the crosspiece portion 9 is in a state with almost no torque during driving. Furthermore, the crosspiece 9 is vertically guided by a guide rod 13, which engages in a guide gap 14 of a guide flange 15 provided on the underside of the hydraulic working cylinder 7. The guide rod 13C passes through the free hole 16 of the support plate 5.

A blending piston 17 is disposed within the blending cylinder 1 so as to be movable along the center line 1. The blending piston 17 is attached to the inner wall 1 of the blending cylinder I by a packing 18.
It is closely tied to 9. The blending piston 17 has
A piston rod 20 is attached that protrudes upward toward the crosspiece 9 and is coaxial with the centerline 11, and the piston rod 20 freely joins to a thrust support 2I provided on the crosspiece 9. Therefore, the piston rod 20 and the thrust support 21
are not connected to each other, i.e. the blending piston 17 is
It is arranged floating in the blending cylinder l.

In the blending cylinder 2 for additive substances, the plunger 2
2 is used as a blending piston. As can be seen from FIG. 1, the diameter of this cylindrical rod-shaped plunger 22 is slightly smaller than the diameter of the blending cylinder 2. Plunger 22c, cap nut 2 at the top end of blending cylinder 2
It is coaxially guided with respect to the middle upper line 12 by the front side of the guide bush 24 fixed by 3. A seal 25 that rests against the plunger 22 is also arranged in the guide bush 24 . The guide bush 24 is the packing 2
6 to the inner wall 27 of the blending cylinder 2. The plunger 22 joins freely to a pressure rod 28 which serves as a thrust support and is mounted coaxially to the centerline 12 in the crosspiece 9. A limit switch 29 is arranged in the pressure rod 28, and it is determined by this limit switch 29 whether the plunger 22 is connected to the pressure rod 28 or not. A similar switch (not shown) is provided to check the connection of the piston rod 20 of the compounding piston 7 to the thrust support 21.

The compounding cylinder (■) is screwed into a forest-like holding bush 3o. The retaining bush 30 is fixed to the base plate 3 by a screw, only the center line 31 of which is shown.

Connected to the blending cylinder 1 is a feed connection 32 for the base substance to be blended, and offset by 180° to this is connected a discharge connection 33 for the blended base substance. The supply connection 32 and the discharge connection 33 are arranged in a common horizontal plane extending perpendicularly to the support 6. A supply pipe 34 is arranged in the supply connection 32, the supply pipe 34. 'The main substance to be blended in one pass is fed under pressure to the blending cylinder l, whereby the blending piston 17 is also lifted. That is, the blending cylinder I is filled under pressure. Inside the blending cylinder 1, K is a so-called rotating frame 3.
6 is placed. The rotary frame 36 has a basic cylindrical shape, is still in contact with the inner wall 19 of the cylinder 1 and has a cross-section of 180° in each case.
By rotation, it is configured to open or alternately close the supply connection 32 used as an inlet or the discharge connection 33 used as an outlet. Such a configuration of the rotary frame 36 also applies to the blending cylinder 2. In its lower region, this rotating frame 36 is held tightly against the inner wall 19 of the compounding cylinder 1 by a seal 37 . Furthermore, the rotating frame 36 is supported by a sliding plate 38 made of a suitable plastic, such as polytetrafluoroethylene, which is arranged on one side and is supported by a forest-shaped retaining bush 30.

The rotating frame 36 is provided with a drive pin 39 extending coaxially with respect to the centerline 11 , and the drive pin 39 projects downwardly from the frame 4 through an opening 40 in the retaining bush 30 and a hole 41 in the base plate 3 . ing. The rotating frame 36 is fixed in the axial direction by divided fastening rings 42. For tightening, 42 rings abut against the lower surface of the forest-like retaining bush 30.

A supply connection 44 is also connected to the blending cylinder 2,
Shifting by 180 degrees with respect to the supply connection part 44, the two-way connection part 44°45 to which the discharge connection part 45 is connected lies within the plane in which the supply connection part 32 and the discharge connection part 33 are provided. . Similarly, on the F side of the supply connection 44 and the discharge connection A5, the rotating frame 43 is held tightly against the inner wall 27 of the blending cylinder 2 by a seal 46. The compounding cylinder 2 is likewise screwed into a forest-like retaining bush 47, but
However, it is coupled to the substrate 3 by another method which will be described later. The rotating frame 43 includes a sliding plate 48 formed similarly to the sliding plate 38.
It is supported at the end surface at the top. Four drive pins are attached to the rotating frame 43 coaxially with respect to the center line 12, and the drive pins 4
9 indicates the opening 50 of the holding bush 47 and the elongated hole 51 of the substrate 3.
It penetrates downward. Also in this case, the rotating frame 43 is fixed in the axial direction by the divided rings 52.

A supply pipe to which a pump is connected can be connected to the supply connection 44 , so that in this case too the additive substance to be blended is fed under pressure to the blending cylinder 2 and thereby to the plunger 22 . is moved from the blending cylinder 1 towards the pressure rod 28.

A main discharge pipe 55 to which a discharge pipe 56 is connected is connected to the discharge connection 33 of the blending cylinder 1 .

The discharge pipe 56 is connected to the discharge connection 45 of the blending cylinder 2 by a quick-detachable fitting 57 . The main substance and the additive substance are guided together completely uniformly,
That is, they only need to be mixed in the main discharge pipe 55. This is made possible by suitable configurations which are outside the scope of the invention. In this case, a rubber filling machine can be connected immediately after the main discharge pipe 55, each stroke of the compounding device corresponding to one rubber filling.

As can be seen from FIG. 3, the rotating frame 43 consists of a substantially cylindrical portion. This cylindrical part projects upwardly beyond the supply connection 44 and the discharge connection 45 and is tightly guided around the periphery, while it rests rotatably against the inner wall 27 of the dosing cylinder 2. A bag-shaped hole used as an axial duct 58 is bored from above in the rotation frame 43 VCId coaxially with respect to the center line 12, and the duct 58 is connected to the supply connection part 44 or the discharge connection part 45. It extends to the lower border. A radial duct 59 formed by a suitable hole like 11 is connected to this axial duct 58 from one side.

Depending on whether the radial duct 59 is positioned in front of the supply connection 44 or in front of the discharge connection 715 by rotation of the rotary frame 43, one of these two connections 44 or 45 can be connected to the plunger. 22 is connected to the upper internal space of the blending cylinder 2 into which it enters. The diameter of the axial duct 58 is such that the pusher 22 can also penetrate into the axial duct 58. The rotary frame 36 of the blending cylinder I is constructed in the same manner, but in this case of course the blending piston 17 cannot penetrate into each of the axial ducts of the rotary frame 36, nor is it necessary. because,
This is because the blending cylinder 1 is formed longer than the blending cylinder 2.

The blending cylinder 2 is connected to the bottom plate 3 by a slide coupling part 60.
is combined with This sliding connection 6° allows a quick exchange of the blending cylinder 2 including the pusher 22. Furthermore, an edge-shaped protrusion 61 is provided on the retaining bush 47.
is mounted, and the protrusion 61 is parallel to each other on two sides,
More precisely, it is arranged parallel to the supply connection 44 and the discharge connection 45. A square holding member 62 is attached to the substrate 3.
is attached, and the holding member 62 engages with the protrusion 61 so as to overlap with it. A long hole 51 formed in the substrate 3 extends toward the supply connection portion 44 side. The mounting of the dosing cylinder 2 takes place as follows: the dosing cylinder 2 is mounted on the base plate 3 in a position offset towards the feed connection 44 with respect to the center line 12, with the drive pin 49 being attached to the base plate 3. This is done so as to penetrate downward through the elongated hole 51 inside. Next, the blending cylinder 2 is moved to the position of the center line ]2, at which time the protrusion 61 engages with the holding member 62 from below, thereby fixing the blending cylinder 2 in the RUa direction. The alignment of the dosing cylinder 2 with the center a12 is obtained in the following way, namely by moving the dosing cylinder 2 to the stop 63 attached to the foot board 3 on the side of the discharge connection 45. can get. The compounding cylinder 2 is then secured by a commercially available snap closure 64. Next, a pipe fitting 57 is connected between the discharge pipe 56 and the discharge connection 45. For the sushi in the blending cylinder 2, do it in the reverse order.

The rotary drive of the rotary frames 36 , 43 between two end positions offset by 180° relative to each other is achieved by a commercially available hydraulic rotary drive in which the drive shaft 66 is connected to the drive pin 39 of the dosing cylinder 1 by means of a bayonet connection 67 . This is done via the drive section 65. Therefore, the drive pin 39 and the drive shaft 66 are formed complementary to each other.

An intermediate shaft 69 is connected to the driven shaft 66 by means of a chain drive straddling toothed belt drive 68, and the intermediate shaft 69 is rotated by the driven shaft 66 in the same direction of rotation and through the same rotation angle 1.
Driven at 80°. This intermediate shaft 69 is arranged in alignment with the centerline 12 and engages the drive pin 49 of the rotating frame 43 by means of a bayonet connection 70 . The plug connection 7 (lj:) is formed in such a way that by moving the compounding cylinder 2, the connection in one of the two end states of the rotary frame 430 can be obtained in the manner described above, or in such a way that it can be released.

A bearing support portion 71 is formed on the lower surface of the substrate 3, and within the bearing support portion 71, a driven shaft 66 and an intermediate shaft 69 are supported by ball bearings 72, respectively. Furthermore, a hydraulic rotary drive 65 is attached to this bearing carrier.

The frame 4 can be suspended, but can also be supported with respect to the ground via the base 73.

Due to the complete translation of the crosspiece 9, the mixing piston 17
and plunger 22 are each driven with completely equal strokes. Therefore, the ratio of the main substance to the additive substance conveyed during one stroke by the blending cylinders 1 and 2 is as follows:
and the cross section F22 of the plunger 22. Therefore, in order to change this ratio, the plunger 22 with the guide bush 24 must be replaced with a plunger 22 of a different diameter.
Just replace it with . In any case, compounding cylinder 2
Since the cross section F2 of the plunger 22 is considerably larger than the cross section F22 of the plunger 22 (for example, the cross section ratio is between 4 and IO), the ratio of main substance to additive substance can be varied within a very wide range.

Rotating frame 36, compounding cylinder 1 at appropriate position of 4.3
．． Since the filling in step 2 is carried out under pressure using a pump, only the extrusion and blending of the main substance and additive substance using the hydraulic working cylinder 7 is performed using the mixing piston 17 or plunger 22.
It is done using wo.

It is clear that purely volumetric blending takes place in the blending device described above. However, because the incompressible or sufficiently incompressible main substance and additive substance are usually blended, they are also blended in a predetermined quantitative ratio.

[Brief explanation of drawings]

Fig. 1 is a front view showing a part of the compounding device according to the present invention in cross section, Fig. 2 is an enlarged sectional view taken along line ■-■ in Fig. 1;
FIG. 3 is an enlarged view of the additive material mixing cylinder shown in FIG. 1 and rotated through 90 degrees. 1.2...Blending cylinder 17...Blending piston 22...Plunger 24...Guide bush 19-

Claims (8)

[Claims] (1) In particular, with a blending cylinder for the main substance and at least one blending cylinder for the additive substance, which is blended in each case in a predetermined but variable volume ratio with respect to the main substance. A compounding device for highly viscous substances, in which each compounding cylinder is provided with a compounding piston that can be driven by a common drive, the drive and the compounding piston are arranged in a common frame, and each compounding cylinder is provided with a compounding piston that can be driven by a common drive. In a blending device in which a supply connection part and a discharge connection part are connected to each other, and one of the supply connection part and the discharge connection part can be opened and closed by a three-way valve, the blending cylinders (182) are arranged parallel to each other. and the blending pistons (17, 2) of the blending cylinders (1, 2)
22) can be driven with equal strokes, the dosing piston of at least one dosing cylinder (2) for the additive substance having a smaller cross-section (F22) than the cross-section (F2) of the dosing cylinder (2); The plunger (22) is configured as a plunger (22) with a replaceable guide bush (24) of the dosing cylinder (2).
A compounding device characterized in that it is closely guided inside the device. (2) A compounding cylinder according to claim 1, characterized in that at least one compounding cylinder (2) for additive substances is exchangeably connected to the frame (4) as a structural unit. . (3) a dosing piston (17) and at least one plunger (22) are connected to each other by means of a common drive (7) for said dosing piston (17) and at least one plunger (22); 2. A compounding device according to claim 1, characterized in that it is connected to a crosspiece (9) movable along the center line of the compounding device (22). (4) In the blending device according to claim 3, in which the main substance and the additive substance are conveyed under pressure into the blending cylinder,
Compounding device, characterized in that at least one plunger (22) is not connected to at least one crosspiece (9). (5) At least one compounding cylinder (2) for additive substances is connected to the frame (4) by means of a quick-detachable connection.
) The blending device according to claim 2, characterized in that the blending device is combined with: (6) Each two-way valve is formed as a rotary plug (36, 43), which rotary plug (36e 43) is connected to each dosing piston (36, 43) of the supply connection (32° 44) and of the discharge connection (33, 45). 1-7, 22) side, each blending cylinder (1-7, 22)
, 2), the blending device according to claim 2, characterized in that it is tightly connected to the inner wall (19, '27) of the . (7) The blending device according to claim 6, characterized in that the rotating stopper (36, 43) is supported by a sliding plate (38° 48) at its end face. (8) the at least one rotary stopper (43) of the at least one dosing cylinder (2) of the additive substance reservoir is connected to the rotary drive (65) by a removable connection (7o);
Claim 2 characterized in that it is combined with
The compounding cylinder according to item 6 or item 6.